ORGANIC ELECTROLUMINESCENCE ELEMENT
An organic electroluminescence element includes: an organic layer which is located between a first electrode layer and a second electrode layer; a light extraction layer which is located on at least one surface of the first electrode layer and the second electrode layer so that directivity of light is changed; and a substrate located on the light extraction layer. The light extraction layer has a base material and a light-scattering particle of 1 to 5 wt. % of the base material. The above configuration allows a light extraction layer to be a single layer and makes it difficult to form a gap at an interface between a base material and light-scattering particles, so that light extraction efficiency can be enhanced.
1 . An organic electroluminescence element, comprising:
an organic layer which is located between a first electrode layer and a second electrode layer;
a light extraction layer which is located on at least one surface of the first electrode layer and the second electrode layer so that directivity of light is changed; and
a substrate located on the light extraction layer, wherein
the light extraction layer has a base material which constitutes the light extraction layer and a light-scattering particle of 1 to 5 wt. % of the base material.
2 . The organic electroluminescence element according to claim 1 , wherein
a particle diameter of the light-scattering particle is 0.1 to 10 μm.
3 . The organic electroluminescence element according to claim 1 , wherein
the light-scattering particle is a particle whose shape differs in a long axis direction and a short axis direction.
4 . The organic electroluminescence element according to claim 1 , wherein
the light-scattering particle has an irregular configuration on its surface.
5 . The organic electroluminescence element according to claim 1 , wherein
a difference between a refractive index of the base material constituting the light extraction layer and a refractive index of the light-scattering particle is 0.15 to 0.45.
6 . The organic electroluminescence element according to claim 1 , wherein
a refractive index of the base material constituting the light extraction layer and a refractive index of the first electrode layer or the second electrode layer contacting the light extraction layer is substantially equal to each other.
7 . The organic electroluminescence element according to claim 1 , wherein
the light-scattering particle has a refractive index smaller than that of the base material.